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    Optical head, method of manufacturing the same, and diffraction element suitable therefor
    2.
    发明授权
    Optical head, method of manufacturing the same, and diffraction element suitable therefor 失效
    光学头，其制造方法和适用于其的衍射元件

    公开(公告)号：US06304312B1

    公开(公告)日：2001-10-16

    申请号：US09101776

    申请日：1998-07-22

    申请人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    发明人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    IPC分类号： G02F113

    CPC分类号： G11B7/1353 ,  G02B5/1833 ,  G02F1/133365 ,  G02F1/292 ,  G02F2001/133757 ,  G11B7/22

    摘要： As an optically anisotropic diffraction grating in an optical head for reading and/or writing of an optically recording medium, optically anisotropic diffraction grating which comprises an optically anisotropic polymer liquid crystal sandwiched between two transparent substrates are used. The optically anisotropic polymer liquid crystal can have an alignment direction periodically changed to form a grating of different refractive indices, obtaining a high-utilization efficiency by light ray and a high degree of reliability.

    摘要翻译： 作为用于读取和/或写入光学记录介质的光学头中的光学各向异性衍射光栅，使用包含夹在两个透明基板之间的光学各向异性聚合物液晶的光学各向异性衍射光栅。 光学各向异性聚合物液晶可以具有周期性地改变的取向方向以形成不同折射率的光栅，通过光线获得高利用效率和高可靠性。

    Optical head device including an optically anisotropic diffraction grating and process for its production
    4.
    发明授权
    Optical head device including an optically anisotropic diffraction grating and process for its production 失效
    包括光学各向异性衍射光栅的光学头装置及其生产方法

    公开(公告)号：US06271966B1

    公开(公告)日：2001-08-07

    申请号：US09524742

    申请日：2000-03-13

    申请人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    发明人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    IPC分类号： G02B518

    CPC分类号： G11B7/1353 ,  G02B5/1833 ,  G11B7/22

    摘要： An object is to provide an optical head device whereby the light utilization efficiency can be increased and which can be produced at a low cost. A glass substrate 1 having projections and recesses 2 formed by patterning a SiON type transparent thin film on its inner surface by dry etching, and a second glass substrate 3 having a polyimide film 4 formed as an alignment film on its inner surface, are laminated with a space, the periphery is sealed by a sealing material made of an epoxy resin 5, and liquid crystal 6 is injected under vacuum into the interior to form an optically anisotropic diffraction grating. On the outer surface of this second glass substrate 3, a quarter-wave film 7 is laminated, and a third glass substrate 9 is bonded by a photopolymer 8 to obtain a diffracting element 10. This diffracting element 10 is disposed between a light source and an optical recording medium to obtain an optical head device.

    摘要翻译： 本发明的目的是提供一种能够提高光利用效率并且可以以低成本生产的光学头装置.1。一种玻璃基板1，其具有通过在其内表面上图案化SiON型透明薄膜而形成的凸部和凹部2， 干法蚀刻，并且在其内表面上具有形成为取向膜的聚酰亚胺膜4的第二玻璃基板3层叠有空间，周边由环氧树脂5制成的密封材料密封，液晶6为 在真空下注入内部以形成光学各向异性衍射光栅。 在该第二玻璃基板3的外表面上层叠四分之一波长膜7，通过光聚合物8将第三玻璃基板9接合，得到衍射元件10.该衍射元件10配置在光源和 光学记录介质，以获得光学头装置。

    Optical head device including an optically anisotropic diffraction grating and production method thereof
    5.
    发明授权
    Optical head device including an optically anisotropic diffraction grating and production method thereof 失效
    包括光学各向异性衍射光栅的光学头装置及其制造方法

    公开(公告)号：US6118586A

    公开(公告)日：2000-09-12

    申请号：US43908

    申请日：1998-03-31

    申请人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    发明人： Yuzuru Tanabe ,  Tomoki Gunjima ,  Hiromasa Sato ,  Hiroki Hotaka

    IPC分类号： G11B7/1353 ,  G02B5/18 ,  G11B7/135 ,  G11B7/22 ,  G11B11/00

    CPC分类号： G11B7/1353 ,  G02B5/1833 ,  G11B7/22

    摘要： An object is to provide an optical head device whereby the light utilization efficiency can be increased and which can be produced at a low cost. A glass substrate 1 having projections and recesses 2 formed by patterning a SiON type transparent thin film on its inner surface by dry etching, and a second glass substrate 3 having a polyimide film 4 formed as an alignment film on its inner surface, are laminated with a space, the periphery is sealed by a sealing material made of an epoxy resin 5, and liquid crystal 6 is injected under vacuum into the interior to form an optically anisotropic diffraction grating. On the outer surface of this second glass substrate 3, a quarter-wave film 7 is laminated, and a third glass substrate 9 is bonded by a photopolymer 8 to obtain a diffracting element 10. This diffracting element 10 is disposed between a light source and an optical recording medium to obtain an optical head device.

    摘要翻译： PCT No.PCT / JP96 / 02872 Sec。 371日期1998年3月31日 102（e）1998年3月31日PCT PCT 1996年10月3日PCT公布。 公开号WO97 / 13245 日期：1997年04月10日目的在于提供一种能够提高光利用效率并且可以以低成本生产的光学头装置。 具有通过干蚀刻在其内表面上图形化SiON型透明薄膜而形成的凸部和凹部2的玻璃基板1和具有在其内表面上形成为取向膜的聚酰亚胺膜4的第二玻璃基板3层叠 一个空间，周边被由环氧树脂5制成的密封材料密封，液晶6在真空下注入内部以形成光学各向异性的衍射光栅。 在该第二玻璃基板3的外表面上层叠四分之一波长膜7，通过光聚合物8将第三玻璃基板9接合，得到衍射元件10.该衍射元件10配置在光源和 光学记录介质，以获得光学头装置。

    Polarizing diffraction element and optical head device
    6.
    发明授权
    Polarizing diffraction element and optical head device 失效
    极化衍射元件和光学头装置

    公开(公告)号：US07738346B2

    公开(公告)日：2010-06-15

    申请号：US11474435

    申请日：2006-06-26

    申请人： Yoshiharu Ooi ,  Hiromasa Sato ,  Tomoki Gunjima

    发明人： Yoshiharu Ooi ,  Hiromasa Sato ,  Tomoki Gunjima

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1353 ,  G02B5/18 ,  G02B5/30 ,  G03H1/0248 ,  G03H2222/31 ,  G11B7/1275

    摘要： A polarizing diffraction element having a wavelength selectivity which functions as a polarizing diffraction element at a wavelength λ1, and which does not function as a diffraction grating not depending on incident polarization state and shows high transmittance at a wavelength λ2, and an optical head device employing the element, are provided.The polarizing diffraction element selectively diffracts or transmits incident light having two different wavelengths each containing a first circularly polarized light and a second circularly polarized light having a rotation opposite from the rotation of the first circularly polarized light, depending on wavelength and polarization state of the incident light. Then, a reflective wavelength region for at least the first circularly incident light, does not contain said two incident wavelengths.

    摘要翻译： 具有波长选择性的偏振衍射元件，该波长选择性用作波长λ1的偏振衍射元件，并且不用作不依赖于入射偏振态的衍射光栅，并且在波长λ2处表现出高的透射率;以及采用 提供了元素。 偏振衍射元件选择性地衍射或透射具有两个不同波长的入射光，每个入射光包含第一圆偏振光和具有与第一圆偏振光的旋转相反的旋转的第二圆偏振光，这取决于事件的波长和偏振状态 光。 然后，至少第一圆形入射光的反射波长区域不包含所述两个入射波长。

    Polarizing diffraction element and optical head device
    7.
    发明申请
    Polarizing diffraction element and optical head device 失效
    极化衍射元件和光学头装置

    公开(公告)号：US20060239171A1

    公开(公告)日：2006-10-26

    申请号：US11474435

    申请日：2006-06-26

    申请人： Yoshiharu Ooi ,  Hiromasa Sato ,  Tomoki Gunjima

    发明人： Yoshiharu Ooi ,  Hiromasa Sato ,  Tomoki Gunjima

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1353 ,  G02B5/18 ,  G02B5/30 ,  G03H1/0248 ,  G03H2222/31 ,  G11B7/1275

    摘要： A polarizing diffraction element having a wavelength selectivity which functions as a polarizing diffraction element at a wavelength λ1, and which does not function as a diffraction grating not depending on incident polarization state and shows high transmittance at a wavelength λ2, and an optical head device employing the element, are provided. The polarizing diffraction element selectively diffracts or transmits incident light having two different wavelengths each containing a first circularly polarized light and a second circularly polarized light having a rotation opposite from the rotation of the first circularly polarized light, depending on wavelength and polarization state of the incident light. Then, a reflective wavelength region for at least the first circularly incident light, does not contain said two incident wavelengths.

    摘要翻译： 具有波长选择性的偏振衍射元件，该波长选择性用作波长λ1的偏振衍射元件，并且不用作不依赖于入射偏振状态的衍射光栅，并且在波长处表现出高的透射率 λ2＆gt;和采用该元件的光学头装置。 偏振衍射元件选择性地衍射或透射具有两个不同波长的入射光，每个入射光包含第一圆偏振光和具有与第一圆偏振光的旋转相反的旋转的第二圆偏振光，这取决于事件的波长和偏振状态 光。 然后，至少第一圆形入射光的反射波长区域不包含所述两个入射波长。

    Liquid crystal lens element and optical head device
    8.
    发明申请
    Liquid crystal lens element and optical head device 有权
    液晶透镜元件和光头装置

    公开(公告)号：US20070146625A1

    公开(公告)日：2007-06-28

    申请号：US11589088

    申请日：2006-10-30

    申请人： Yoshiharu Ooi ,  Yuzuru Tanabe ,  Hiromasa Sato ,  Takuji Nomura ,  Ryuichiro Shimizu

    发明人： Yoshiharu Ooi ,  Yuzuru Tanabe ,  Hiromasa Sato ,  Takuji Nomura ,  Ryuichiro Shimizu

    IPC分类号： G02F1/13

    CPC分类号： G11B7/1378 ,  G02B3/08 ,  G02B13/14 ,  G02F1/133371 ,  G02F1/29 ,  G02F2001/294 ,  G11B2007/0006 ,  G11B2007/13722

    摘要： A liquid crystal lens element is provided, which can realize a small sized element having no moving part, and which has a lens function of switching the focal length among multiple focal lengths of at least 3 types according to an applied voltage. A liquid crystal lens element 10 is provided, which comprises a pair of transparent substrates 11 and 12 and a liquid crystal layer sandwiched between these substrates, wherein focal lengths of light transmitted through the liquid crystal 16 is changed depending on a voltage applied to the liquid crystal 16, the liquid crystal lens element 10 has a Fresnel lens-shaped concave-convex portion 17 and a liquid crystal layer 16A, and configured so that the refractive index n of the liquid crystal layer 16A changes from a refractive index n1 at a time of no application to a refractive index n2 at a time of voltage application, a refractive index ns of the concave-convex portion 17 is a value between the refractive indexes n1 and n2 and satisfies a predetermined relation, and the maximum depth d of the concave-convex portion 17 satisfies a predetermined relation, the focal length can be switched by switching an applied voltage to the liquid crystal layer 16A under the predetermined conditions.

    摘要翻译： 提供一种液晶透镜元件，其可以实现不具有移动部分的小尺寸元件，并且具有根据施加的电压在至少3种类型的多个焦距之间切换焦距的透镜功能。 提供了一种液晶透镜元件10，其包括一对透明基板11和12以及夹在这些基板之间的液晶层，其中透射通过液晶16的光的焦距根据施加到液体的电压而改变 晶体16中，液晶透镜元件10具有菲涅耳透镜形状的凹凸部17和液晶层16A，构成为使液晶层16的折射率n从折射率n < 在施加电压时，在不施加折射率n <2的情况下，SUB> 1 1的折射率n 部分17是折射率n 1和n 2之间的值，并且满足预定关系，并且凹凸部17的最大深度d满足预定关系 ，可以通过将施加的电压切换到l来切换焦距 在预定条件下的iquid晶体层16A。

    Liquid crystal lens element and optical head device
    9.
    发明授权
    Liquid crystal lens element and optical head device 有权
    液晶透镜元件和光头装置

    公开(公告)号：US07388822B2

    公开(公告)日：2008-06-17

    申请号：US11498076

    申请日：2006-08-03

    申请人： Yoshiharu Ooi ,  Hiromasa Sato ,  Ryuichiro Shimizu ,  Takuji Nomura ,  Yuzuru Tanabe ,  Mitsuo Oosawa

    发明人： Yoshiharu Ooi ,  Hiromasa Sato ,  Ryuichiro Shimizu ,  Takuji Nomura ,  Yuzuru Tanabe ,  Mitsuo Oosawa

    IPC分类号： G11B7/00

    CPC分类号： G11B7/1275 ,  G02F1/133526 ,  G02F1/29 ,  G02F2001/294 ,  G02F2203/18 ,  G11B7/1353 ,  G11B7/1369 ,  G11B7/1378 ,  G11B7/13925 ,  G11B2007/0006 ,  G11B2007/0013

    摘要： A liquid crystal lens element having a lens function is provided, which is small sized without having moving part, and which can stably carry out correction of spherical aberration containing a power component corresponding to focal point change of incident light.A liquid crystal lens element which changes a focal length of light transmitted through a liquid crystal 16 according to the magnitude of the voltage applied to the liquid crystal 16 sandwiched between a pair of transparent substrates 11 and 12, which comprises transparent electrodes 13 and 14 provided on the respective transparent substrates 11 and 12 for applying a voltage for the liquid crystal 16, and a concave-convex portion 17 having a saw-tooth-shaped cross-sectional shape having a rotational symmetry about an optical axis and formed on one surface of the transparent electrode 13 with a transparent material, wherein at least concave portions of the concave-convex portion 17 are filled with the liquid crystal 16 so as to change the substantial refractive index of the liquid crystal 16 according to the magnitude of applied voltage.

    摘要翻译： 提供了具有透镜功能的液晶透镜元件，其尺寸小而不具有移动部分，并且可以稳定地执行包含对应于入射光的焦点变化的功率分量的球面像差的校正。 一种液晶透镜元件，其根据施加到夹在包括透明电极13和14的一对透明基板11和12之间的液晶16的电压的大小而改变透射通过液晶16的光的焦距，该透明基板11和12包括透明电极13和14 在用于施加液晶16的电压的各个透明基板11和12上，以及具有围绕光轴旋转对称的锯齿状截面形状的凹凸部17，并形成在 具有透明材料的透明电极13，其中凹凸部17的至少凹部被液晶16填充，以便根据施加电压的大小改变液晶16的实质折射率。